Maleic anhydride
CAS 108-31-6C4H2O398.06 g/mol
Maleic anhydride is a cyclic dicarboxylic anhydride that is the cyclic anhydride of maleic acid. It has a role as an allergen. It is a member of furans and a cyclic dicarboxylic anhydride.
IUPAC: furan-2,5-dione
PubChem
Physical & Chemical Properties
| Melting Point | 127 °F (NTP, 1992) |
| Boiling Point | 387 to 390 °F at 760 mmHg (NTP, 1992) |
| Density | 1.43 at 59 °F (USCG, 1999) - Denser than water; will sink |
| Solubility | Soluble; decomposes in hot solvent (NTP, 1992) |
| Flash Point | 218 °F (NTP, 1992) |
| Vapor Pressure | 0.2 mmHg (NIOSH, 2024) |
| pH | pH of water solutions: 2.42 at 1X10-2 M; 2.62 at 5X10-3 M; 3.10 at 1X10-4 M |
| Appearance | Maleic anhydride appears as colorless crystalline needles, flakes, pellets, rods, briquettes, lumps or a fused mass. Melts at 113 °F. Shipped both as a solid and in the molten state. Vapors, fumes and dusts strong irritate the eyes, skin and mucous membranes. Flash point 218 °F. Autoignition temperature 890 °F. Used to make paints and plastics and other chemicals. |
Data: PubChem · Last updated: 4/20/2026
GHS Classification
No GHS classification data available.
Classification data is sourced from ECHA.
Regulatory Compliance
TSCA
Listed
note: Status based on EPA TSCA Active Inventory · inventory name: TSCA Chemical Substance Inventory
View sourceGlobal Trade Intelligence
No trade flow data available for this chemical.
HS Code(s): 2917
Data: UN Comtrade
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